Extensible pitman-rod.



iATBNIBfiJ-AN. 23, 1906.

W. R. ONEILL.

EXTENSIBLE PITMAN ROD.

uruoumn FILED JULY 3. 1905.

furor/nu;

I INI' f TED STATES PATENT OFFICE.

WILLIAM R. ONEILL, 0F FINDLAY, OHIO.

EXTENSIBLE PlTMAN-ROD.

T0 (1 7 1) whom it may concern:

Be it known that 1, WILLIAM R. ONEILL, a citizen of the United States,residing at Findlay, in the county of Hancock and State of 01ahaveinvented certain new and useful lfr'n ivements in ExtensiblePitrnan-Rods; and i do declare the following to-be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appe'rtains to make and use the same.

This invention relates to improvements in extensible pitinan-rods.

The object of the invention is to provide a pitman-rod of this characterfor use in connection with well-drilling machinery, whereby should thedrill become stuck the pitman will give sulficiently to permit the crankon the operating mechanism to turn round, thus preventing the breakingof any of the parts or the throwing off of the driving-belt.

A further object is to provide a pitman of this character which will besimple, strong and durable in construction, efiicient in operation, andwell adapted to the purpose for which it is designed.

With these and other objects in view the invention consists of certainnovel features of construction, combination, and arrangement of parts,as will be hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a side elevation of a portionof a well-drilling machine, showing the application of the invention.Fig. 2 is an enlarged side elevation of the pitman. Fig. 3 is alongitudinal sectional view on the line 3 3 of Fig; 2, and Fig. 4 is across-sectional view on the line 4 4 of Fig. 2.

Referring more particularly to the drawings, 1 denotes a drive-wheel orband-pulley of a well-drilling machine, which is suitably? mounted upona drive-shaft 2, on one end of which is arranged a crank 3. To the outerend of the crank 3 is connected one end of a yielding pitman-rod 4, theopposite end of which is connected to the walking-beam 5 of adrill-operating mechanism. To the opposite end of the walking-beam isconnected a cable, which carries thcdrill-rod. These latter parts beingof the usual or any desired construction it is not deemed necessary toillustrate the same.

The present invention consists in the peculiar construction andarrangement of the pitman-rod, whereby the same is adapted to beextended so that. should the drill becomestuck Specification of LettersPatent. Application fil d July 3, 1905. Serial No. 268,097.

Patented Jan. 23, 1906.

the other parts of the drilling machinery will not be broken bycontinued operation of the driving mechanism, and to this end thepitman-rodfi is formed in two sections or parts 6 and 7. The lower partof the pitman-rod, or that part which is connected to the crankarm 3, isin the form of a yoke or bail consisting of parallel side bars 8, whichare bolted or otherwise connected at their lower ends to a wrist-pinblock 9, in the end of which is formed an aperture to engage thewrist-pin on the crank-arm 3. The upper ends of the side bars 8 areconnected by an apertured part 10. The upper pa'rt 7 of the pitmanrod,or that part which connects directly with the walking-beam 5, is in theform of an open frame consistingof parallelside bars 11, which areconnected at their lower ends by an apertured part 12. The upper end ofthe side bars terminate in the form of a stirrup 13, with which isengaged the end of the walkingbeam.

In assembling'the parts the frame 7 is engaged with the yoke 6, asshown, and through the apertured parts 10 and 12 of said frame and yokeis inserted a bolt 14, the lower end of which is provided with anadjustable nut 15. On the bolt 14 between the parts 10 and 13 isarranged-a coil-spring 16, the tension of which is exerted to hold theengaged ends the yoke and frame apart to the limit allov. cd

by the bolt 14:. On the bolt 14 between the opposite ends of the spring16 and the adjacent disk of. the frame and yoke are arranged apertu redguide-plates 17. Said plates are pnpvidedwith notchesor recesses 17arranged in the edges thereof to engage the adjacent side bars of theframe 6 and yoke 7, thereby guiding and holding the same in properposition to permit the two parts of the pitmanrod to be actuated toextend or increase the length of the same.

By the, use of a pitman-rod constructed as herein shown and describedshould the operating mechanism of the drill become locked the stickingof the drill-tool the driving inechanism will be permitted to continuein operation without danger of breaking any of the parts or of throwingoff the driving-belt, the elastic construction of the 'pitman-rodpermitting the crank-shaft and the crank tothe construction andoperation of the invenv tion will be readily understood withoutrequiring a more extended explanation.

Having thus described my invention, what I claim as new, and desire 'tosecure by Letters Patent, is v A pitman formed in two parts or sections,one of which consists of an open frame 7,"having at one end anintegrally-formed, apertured part 12, a bail or yoke 8 to engage saidopen frame, and form the other part or section of said pitman; said yokehaving at its inner end an integral apertured part. 10, a bolt 14arranged in said' apertured parts to connect the sections of said pitmantogether, a-spring arranged on said bolt between said parts, and I 5apertured guide-plates 17 arranged on the bolt between the ends of thespringand said apertured parts, said plates having guide-recesses formedin their edges to receive the side bars of the frame and yoke formingthe pitman, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

. WILLIAM R. ONEILL.

Witnesses:

:F. F. GILLESPIE,

C. .A. ALLEN.

